Multiflora Rose is a plant which is not poisonous or deadly, however, I would rather roll around in a coil of barbed-wire fencing than try to walk through a thicket of Multiflora Rose - even with a machete.
This is a life- size photo of the barbs on a Multiflora Rose. These "hooks" tear into you and can immobilize you like razor-ribbon. Deer can not get through it - in fact, it is a "living fence". A prison would be well served by a circle of these plants.
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